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Robertshaw made them originally (I think).
I take them off when I find them on units. They are a probable refrigerant leak source and the dampers aren't worth a sh*t when it's really cold and you need them to work. I usually put on a fan speed controller or VFD if the units big enough. Honeywell has a damn reliable VFD. I forget who makes it for them, but it really works well. I've put in a couple with no call backs or problems.
I wouldn't use a Siemens VFD if they paid me to. We put in one and had nothing but problems with it.
Just my 2 cents.
jogas

Trane parts, Tarrant Parts or United (Robertshaw)

Depends on where I am,wether I want to pick them up or have them drop shipped & my mood, there all about the same to me.

I agree they are possible leak points, but, so are alot of other things we install.
There is no such thing as the "perfect" unit. Its hard to tell where to start & end with that philosophy, atleast for me.